Instead of non removable battery it should be called difficult to replace batteries. I literally went through 3old phones this year all phones where I opened the back without professional help. And all three times it was swollen batteries (old phones that I used for backup.) Needless to say all those phones I could not find a cheap or affordable battery online. And if I did find one I'd need to import it to South Africa from China or India or wherever which would cost as much as a new phone😅😬
